LM2574N-5G ON Semiconductor, LM2574N-5G Datasheet - Page 23

• Manufacturer Part Number: LM2574N-5G
• Description: IC REG SW 0.5A 5V STEPDOWN 8-DIP
• Manufacturer: ON Semiconductor
• Type: Step-Down (Buck)r

Specifications of LM2574N-5G

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 500mA
• Frequency - Switching: 52kHz
• Voltage - Input: 4.75 ~ 40 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Output Voltage: 5 V
• Output Current: 0.5 A
• Input Voltage: 4.75 V to 40 V
• Switching Frequency: 52 KHz
• Operating Temperature Range: - 40 C to + 125 C
• Mounting Style: Through Hole
• Duty Cycle (max): 98 %
• Primary Input Voltage: 12V
• No. Of Outputs: 1
• No. Of Pins: 8
• Filter Terminals: DIP
• Input Voltage Primary Max: 40V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: LM2574N-5GOS

References
• Marty Brown “Practical Switching Power Supply Design”, Academic Press, Inc., San Diego 1990
• Ray Ridley “High Frequency Magnetics Design”, Ridley Engineering, Inc. 1995
+V
Gnd
+V
in
The LM2574−ADJ Step−Down Voltage Regulator with 5.0 V @ 0.5 A Output Power Capability Typical
in
= 7.0 to 40 V
Figure 40. PC Board Layout Component Side
Unregulated
DC Input
Gnd
+
22 mF
C1
Figure 39. Schematic Diagram of the 5.0 V @ 0.5 A Step−Down Converter Using the LM2574−ADJ
C1
D1
+V
LM2574
in
5
NOTE: Not to scale.
U1
4
(12)
(An additional LC filter is included to achieve low output ripple voltage)
L1
Pwr
Gnd
(6)
LM2574−ADJ
R1 R2
2
Application With Through−Hole PC Board Layout
Sig
Gnd
(4)
3
C2
(14)
C1
C2
C3
D1
L1
L2
R1
R2
(3)
ON/OFF
+
(5)
L2
7
1
Output
−
−
−
−
−
−
−
−
Feedback
C3
22 mF, 63 V, Aluminium Electrolytic
220 mF, 16 V, Aluminium Electrolytic
100 mF, 16 V Aluminium Electrolytic
1.0 A, 40 V, Schottky Rectifier, 1N5819
330 mH, RL−1284−330, Renco Electronics
25 mH, SFT52501, TDK
2.0 kW, 0.1%, 0.25 W
6.12 kW, 0.1%, 0.25 W
LM2574, NCV2574
+
http://onsemi.com
V
Gnd
out
D1
1N5819
330 mH
23
L1
C2
220 mF
Figure 41. PC Board Layout Copper Side
R2
6.12 kW
R1
2.0 kW
NOTE: Not to scale.
Ripple Filter
22 mH
100 mF
L2
Output
C3
Regulated
Output Filtered
V
out
= 5.0 V @ 0.5 A
Gnd